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7矩形.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        canvas {
            border: 1px solid red;
        }
    </style>
</head>

<body>
    <canvas width="500" height="500"></canvas>
    <script>
        // 获取dom节点
        const canvas = document.querySelector("canvas")
        // 获取画笔
        const ctx = canvas.getContext("2d") // 2d 表示 画的2d图
        ctx.fillStyle = "red"
        ctx.strokeStyle = "red";
        ctx.rect(200, 200, 100, 100);
        ctx.fill();
        ctx.stroke();

        //简写
        ctx.fillStyle = "red"
        ctx.fillRect(400, 400, 50, 50);
    </script>
</body>

</html>